CN110748492A - Self-cleaning submersible electric pump and self-cleaning method suitable for same - Google Patents
Self-cleaning submersible electric pump and self-cleaning method suitable for same Download PDFInfo
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- CN110748492A CN110748492A CN201911033835.6A CN201911033835A CN110748492A CN 110748492 A CN110748492 A CN 110748492A CN 201911033835 A CN201911033835 A CN 201911033835A CN 110748492 A CN110748492 A CN 110748492A
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- impeller
- sealing
- cavity
- sealing section
- water
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- 238000004140 cleaning Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 11
- 238000007789 sealing Methods 0.000 claims abstract description 99
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 238000002955 isolation Methods 0.000 claims abstract description 36
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 11
- 238000005406 washing Methods 0.000 abstract description 8
- 238000009991 scouring Methods 0.000 description 10
- 239000010865 sewage Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/588—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps cooling or heating the machine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a self-cleaning submersible electric pump, which comprises a pump body, wherein an impeller and a return pipe are arranged in the pump body; the impeller divides the inner cavity of the pump body into an impeller cavity and a sealing cavity; a driving device connected with the impeller is arranged in the sealing cavity, and a sealing section is arranged at the connecting section of the driving device and the impeller; an isolation cylinder is arranged in the sealing cavity and is arranged outside the sealing section and an impeller shaft sleeve of the impeller; a gap for water to pass through is reserved between the isolation cylinder and the impeller shaft sleeve; the return pipe can send the water in the pump body into the isolation cylinder. When the water pump works, the driving device drives the impeller to rotate, the backflow pipe conveys water flow into the isolation cylinder, the sealing section rotating along with the impeller in the isolation cylinder drives the water flow to rapidly rotate in a limited space, the sealing section in the sealing inner cavity washes a vortex, and the washing effect on the sealing section is good.
Description
Technical Field
The invention relates to the field of sealing of submersible electric pumps, in particular to a submersible electric pump with stable sealing and a self-cleaning method of a self-cleaning submersible electric pump.
Background
The submersible electric pump has wide application, and relates to the fields of industry, municipal engineering, water conservancy, various buildings, agricultural water supply and drainage, sewage treatment and the like. Is used for pumping waste water, domestic sewage, rainwater and the like containing solid particles and various fibrous dirt. The hydraulic component is efficient, free of blockage and anti-winding, and is structurally developed rapidly due to the fact that the hydraulic component is integrated with the mechanical and electrical components, compact in structure and small in size.
However, fibrous dirt and solid particles exist in sewage, so that a mechanical seal in contact with a medium is easily wound and rubbed and collided, and a mechanical seal spring is unevenly stressed to cause seal failure. For example, sewage in a sewage treatment plant contains more fibrous dirt and is wound by a mechanical seal; the yellow river water contains a large amount of silt, and the mechanical seal rotating at a high speed collides with gravel to quickly cause seal failure; mechanical seal failure leads to leakage, media enter an oil cavity or a motor cavity and need to be shut down for replacement, so that maintenance cost is increased and the service life of the submersible electric pump is shortened.
As in application No.: 2007201991581, the name is: "washing exhaust structure for pumping unit enclosure", application No.: 2017202951532, the name is: the patent application of 'a back washing device of a chemical pipeline pump' adopts the technical scheme that an internal circulation washing flow channel is arranged in a pump cover, and pressure water flow generated by the pump flows through the internal circulation washing flow channel to effectively wash a mechanical seal, but the technical scheme does not fundamentally solve the problems of winding and friction impact caused by the fact that a medium contacts the mechanical seal. According to the technical scheme, the problem that the mechanical seal is flushed by circulating water at the later stage of the operation process of the electric pump can be solved, and the mechanical seal is prevented from being wound by sundries and being impacted by friction in the stable working process of the electric pump; when the electric pump is stopped, impurities enter a cavity where the mechanical seal is positioned through a gap between the impeller and the pump cover due to low water pressure in the pump; when the electric pump is started, the mechanical seal in the electric pump is wound or rubbed or even impacted, and the sealing effect is influenced.
Secondly, in the above-mentioned application, rivers flow back along with the pump cover, because the impeller is rotatory, the positive velocity of flow of impeller is fast, can form the low pressure environment, will get into the direct suction of rivers of mechanical seal cavity, wash the rivers in the runner promptly and can directly flow from impeller and pump cover clearance, and is not strong to mechanical seal's washing effect, can't effectively wash mechanical seal.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention aims to solve the defects in the prior art and provides the submersible electric pump which can prevent sundries from approaching the sealing section and has good scouring effect on the sealing section.
The technical scheme of the invention is as follows: the invention relates to a self-cleaning submersible electric pump, which comprises a pump body, wherein an impeller and a return pipe are arranged in the pump body; the impeller divides the inner cavity of the pump body into an impeller cavity and a sealing cavity; a driving device connected with the impeller is arranged in the sealing cavity, and a sealing section is arranged at the connecting section of the driving device and the impeller; an isolation cylinder is arranged in the sealing cavity and is arranged outside the sealing section and an impeller shaft sleeve of the impeller; a gap through which water can pass is reserved between the isolation cylinder and the impeller shaft sleeve; the isolating cylinder divides the sealing cavity into a sealing inner cavity and a sealing outer cavity; the return pipe can convey the water in the pump body into the isolation cylinder; the water body sent into the isolation cylinder rotates along with the impeller shaft sleeve, and a sealing section rotating vortex capable of flushing the sealing section is formed around the sealing section.
Furthermore, the water inlet of the return pipe is positioned on the high-pressure water side of the outer edge of the impeller.
Furthermore, the return pipe is arranged on the pump cover, and a filter is arranged at a water inlet of the return pipe.
Furthermore, back blades are arranged on the impeller.
The invention relates to a water body flow stabilizing method of a self-cleaning submersible electric pump, which comprises a pump body, wherein impellers and a return pipe are arranged in the pump body; the impeller divides the inner cavity of the pump body into an impeller cavity and a sealing cavity; a driving device connected with the impeller is arranged in the sealing cavity, and a sealing section is arranged at the connecting section of the driving device and the impeller; constructing a cylindrical space capable of wrapping the sealing section in the sealing cavity, and arranging the water outlet of the return pipe in the cylindrical space so that a return water body can enter the cylindrical space; when the submersible electric pump is started, the backflow water body rotates along with the impeller shaft sleeve, and a sealing section rotating vortex capable of flushing the sealing section is formed around the sealing section in the cylindrical space.
Further, the cylindrical space is an isolation cylinder arranged in the sealing cavity; the isolation cylinder is arranged outside the sealing section and an impeller shaft sleeve of the impeller.
Compared with the prior art, the invention has the beneficial effects that:
1. the isolation cylinder is arranged to surround the sealing section and directly isolate the possibility that impurities approach the sealing section from the physical condition; secondly, the complex irregular space in the sealing cavity is changed into a simple cylindrical space, so that the formation of a scouring vortex of the sealing section is facilitated; in the isolation cylinder, the water body is driven to rapidly rotate in the limited space of the isolation cylinder along with the rotation of the impeller, a sealing section scouring vortex is formed in the sealing inner cavity, and the high-flow-rate water generated by the sealing section scouring vortex can effectively scour the sealing section; secondly, under the action of centrifugal force, the water body can be continuously far away from the sealing section, flows out from the gap between the isolation cylinder and the impeller shaft sleeve along with the continuous injection of the water body of the return pipe, and further finishes the washing of the edge of the impeller shaft sleeve in the process of discharging the water body along the gap between the isolation cylinder and the impeller shaft sleeve, so that the self-cleaning effect is good; (ii) a And secondly, the continuously replaced water body can take away heat generated by the sealing section, and the service life of the sealing section is prolonged.
2. The inlet of the return pipe is provided with a filter; the import is located the impeller outer fringe, and the high pressure water side, consequently, can guarantee that the rivers pressure in the return pipe is greater than the pressure in the cavity, and the filter is parallel with rivers outflow direction, can prevent that the filth from assaulting, twining or blockking up the filter, ensures the filter stability of intaking, guarantees to wash the effect.
3. Through the pumping effect of the impeller back blade, liquid around the sealing section is continuously circulated, and filtered clean liquid is always supplemented, so that the dirt entering the cavity through the gap between the impeller and the pump cover can be further prevented.
Drawings
Fig. 1 is a schematic view of the overall structure of a conventional submersible electric pump;
FIG. 2 is a schematic diagram of a pump body of the conventional submersible pump of FIG. 1;
FIG. 3 is a schematic view of the submersible electric pump of the present invention;
FIG. 4 is a schematic structural diagram of a pump cover according to the present invention;
FIG. 5 is a schematic view of the impeller of the present invention;
fig. 6 is a top view of fig. 5.
Wherein, the arrow direction is the water body flowing direction.
Detailed Description
For the understanding of the present invention, the following detailed description will be given with reference to the accompanying drawings, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
Fig. 3-6 show an embodiment of the self-cleaning submersible electric pump according to the present invention, which comprises a pump body 4, wherein the pump body 4 is internally provided with an impeller 3 and a return pipe 6; the return pipe 6 is arranged on the pump cover 43, and a filter 61 is arranged at the water inlet of the return pipe 6. The water inlet of the return pipe 6 is positioned at the high-pressure water side of the outer edge of the impeller 3. The impeller 3 is provided with back blades 32. The impeller 3 divides the inner cavity of the pump body 4 into an impeller cavity 41 and a sealing cavity 42; a driving device 1 connected with the impeller 3 is arranged in the sealing cavity 42, and a sealing section 11 is arranged at the connecting section of the driving device 1 and the impeller 3; the isolating cylinder 2 is arranged in the sealing cavity 42, and the isolating cylinder 2 is arranged outside the sealing section 11 and the impeller shaft sleeve 31 of the impeller 3; a gap for water to pass through is reserved between the isolation cylinder 2 and the impeller shaft sleeve 31; the return pipe 6 can convey the water body in the pump body 4 into the isolation cylinder 2.
In this embodiment, the sealing section 11 may be a mechanical seal.
As shown in fig. 3, a return pipe 6 is arranged on the pump body 4, and the return pipe 6 can send water in the pump body 4 into the seal cavity 42 for flushing the seal section 11; an isolation cylinder 2 is arranged in the sealing cavity 42; the isolation cylinder 2 is arranged outside the sealing section 11 and an impeller shaft sleeve 31 of the impeller 3; a gap for water to pass through is reserved between the isolation cylinder 2 and the impeller shaft sleeve 31;
the isolation cylinder 2 divides the sealing cavity 42 into a sealing inner cavity 421 and a sealing outer cavity 422; when the water pump works, the driving device 1 drives the impeller 3 to rotate, the backflow pipe 6 conveys water flow into the isolation cylinder 2, the sealing section 11 rotating along with the impeller in the isolation cylinder 2 drives the water flow to rapidly rotate in a limited space, a sealing section scouring vortex is formed in the sealing inner cavity 421, high-flow-rate water body for scouring the vortex by the sealing section forms a low-pressure environment for the sealing section 11, so that dirt entering the sealing outer cavity 422 along the gap between the impeller 3 and the pump cover 43 cannot enter the sealing inner cavity 421, meanwhile, the heat of the sealing section 11 is taken away by the high-flow-rate water body, and the dirt is discharged along the gap between the isolation cylinder 2 and the impeller shaft sleeve 31.
The invention has the characteristics of preventing sundries from approaching the sealing section and having good scouring effect on the sealing section, and because the isolating cylinder 2 is arranged to surround the sealing section 11, the possibility of impurities approaching the sealing section 11 is directly isolated from physics; secondly, the complex irregular space in the sealing cavity 42 is changed into a simple cylindrical space, which is beneficial to the formation of the scouring vortex of the sealing section; in the isolation cylinder 2, the impeller 3 rotates to drive the water body to rapidly rotate in the limited space of the isolation cylinder 2, a sealing section scouring vortex is formed in the sealing inner cavity 421, and the high-flow-rate water generated by the sealing section scouring vortex can effectively scour the sealing section; secondly, under the action of centrifugal force, the water body is continuously far away from the sealing section 11, flows out from the gap between the isolation cylinder 2 and the impeller shaft sleeve 31 along with the continuous injection of the water body of the return pipe 6, and further finishes the washing of the edge of the impeller shaft sleeve in the process of discharging the water body along the gap between the isolation cylinder 2 and the impeller shaft sleeve 31, so that the self-cleaning effect is good; secondly, the water body that replaces constantly can take away the heat that sealed section 11 produced, is favorable to prolonging the life of sealed section 11. Secondly, a filter 61 is arranged at the inlet of the return pipe 6; the import is located the impeller outer fringe, and the high pressure water side, consequently, can guarantee that the rivers pressure in the back flow 6 is greater than the pressure in the cavity, and filter 61 is parallel with rivers outflow direction, can prevent that the filth from strikeing, twining or blockking up filter 61, ensures the stability of filter 61 intaking, guarantees the washing effect. Secondly, through the pumping effect of the impeller back vane 32, the liquid around the sealing section is continuously circulated, and the filtered clean liquid is always supplemented, so that the dirt entering the cavity through the gap between the impeller and the pump cover can be further prevented.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to further illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is also intended to be covered by the appended claims. The scope of the invention is defined by the claims and their equivalents.
Claims (6)
1. A self-cleaning submersible electric pump comprises a pump body (4), wherein an impeller (3) and a return pipe (6) are arranged in the pump body (4); the impeller (3) divides the inner cavity of the pump body (4) into an impeller cavity (41) and a sealing cavity (42); a driving device (1) connected with the impeller (3) is arranged in the sealing cavity (42), and a sealing section (11) is arranged at the connecting section of the driving device (1) and the impeller (3); the method is characterized in that: an isolation cylinder (2) is arranged in the sealing cavity (42), and the isolation cylinder (2) is arranged outside the sealing section (11) and an impeller shaft sleeve (31) of the impeller (3); a gap through which water can pass is reserved between the isolation cylinder (2) and the impeller shaft sleeve (31); the isolating cylinder (2) divides the sealing cavity (42) into a sealing inner cavity (421) and a sealing outer cavity (422); the return pipe (6) can send water in the pump body (4) into the isolation cylinder (2); the water body sent into the isolation cylinder (2) rotates along with the impeller shaft sleeve (31) and forms a sealing section rotating vortex which can wash the sealing section (11) around the sealing section (11).
2. The submersible electric pump according to claim 1, characterized in that: the water inlet of the return pipe (6) is positioned on the high-pressure water side of the outer edge of the impeller (3).
3. The submersible electric pump according to claim 1, characterized in that: the return pipe (6) is arranged on the pump cover (43), and a filter (61) is arranged at a water inlet of the return pipe (6).
4. The submersible electric pump according to claim 1, characterized in that: back blades (32) are arranged on the impeller (3).
5. A self-cleaning method of a self-cleaning submersible electric pump comprises a pump body (4), wherein an impeller (3) and a return pipe (6) are arranged in the pump body (4); the impeller (3) divides the inner cavity of the pump body (4) into an impeller cavity (41) and a sealing cavity (42); a driving device (1) connected with the impeller (3) is arranged in the sealing cavity (42), and a sealing section (11) is arranged at the connecting section of the driving device (1) and the impeller (3); the method is characterized in that: a cylindrical space which can wrap the sealing section (11) is constructed in the sealing cavity (42), and the water outlet of the return pipe (6) is arranged in the cylindrical space, so that the return water body can enter the cylindrical space; when the submersible electric pump is started, the backflow water body rotates along with the impeller shaft sleeve (31), and a sealing section rotating vortex capable of flushing the sealing section (11) is formed around the sealing section (11) in the cylindrical space.
6. The submersible electric pump according to claim 5, characterized in that: the cylindrical space is an isolation cylinder (2) arranged in the sealing cavity (42); the isolation cylinder (2) is arranged outside the sealing section (11) and an impeller shaft sleeve (31) of the impeller (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911033835.6A CN110748492A (en) | 2019-10-23 | 2019-10-23 | Self-cleaning submersible electric pump and self-cleaning method suitable for same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911033835.6A CN110748492A (en) | 2019-10-23 | 2019-10-23 | Self-cleaning submersible electric pump and self-cleaning method suitable for same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110748492A true CN110748492A (en) | 2020-02-04 |
Family
ID=69280551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911033835.6A Pending CN110748492A (en) | 2019-10-23 | 2019-10-23 | Self-cleaning submersible electric pump and self-cleaning method suitable for same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110748492A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220984A (en) * | 2011-07-22 | 2011-10-19 | 李冬庆 | Single stage pump with forced circulation rotation-preventing structure |
| CN205533398U (en) * | 2016-01-27 | 2016-08-31 | 成都一通密封股份有限公司 | Mechanical seal for slurry pump |
| CN207864240U (en) * | 2018-01-18 | 2018-09-14 | 辽宁恒星泵业有限公司 | A kind of chemical flow-process pump |
| CN210919483U (en) * | 2019-10-23 | 2020-07-03 | 江苏中兴水务有限公司 | Self-cleaning submersible electric pump |
-
2019
- 2019-10-23 CN CN201911033835.6A patent/CN110748492A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220984A (en) * | 2011-07-22 | 2011-10-19 | 李冬庆 | Single stage pump with forced circulation rotation-preventing structure |
| CN205533398U (en) * | 2016-01-27 | 2016-08-31 | 成都一通密封股份有限公司 | Mechanical seal for slurry pump |
| CN207864240U (en) * | 2018-01-18 | 2018-09-14 | 辽宁恒星泵业有限公司 | A kind of chemical flow-process pump |
| CN210919483U (en) * | 2019-10-23 | 2020-07-03 | 江苏中兴水务有限公司 | Self-cleaning submersible electric pump |
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